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AppleSort.java
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AppleSort.java
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package com.test.java8.c3;
import com.test.java8.c2.Apple;
import org.junit.Before;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import static java.util.Comparator.comparing;
import static java.util.Comparator.comparingInt;
/**
* Created by ryan on 7/20/17.
*/
public class AppleSort {
private List<Apple> inventory;
@Before
public void setUp() {
inventory = new ArrayList<>();
inventory.add(new Apple("red", 1));
inventory.add(new Apple("green", 3));
inventory.add(new Apple("red", 2));
inventory.add(new Apple("yellow", 21));
}
@Test
public void sort_old() {
Collections.sort(inventory, new Comparator<Apple>() {
@Override
public int compare(Apple o1, Apple o2) {
return o1.getWeight() - o2.getWeight();
}
});
printApples();
}
@Test
public void sort1(){
inventory.sort(new Comparator<Apple>() {
@Override
public int compare(Apple o1, Apple o2) {
return o1.getWeight() - o2.getWeight();
}
});
printApples();
}
@Test
public void sort2(){
inventory.sort((o1, o2) -> o1.getWeight() - o2.getWeight());
printApples();
}
@Test
public void sort3(){
inventory.sort(Comparator.comparing((Apple a)->a.getWeight()));
printApples();
}
@Test
public void sort4(){
inventory.sort(Comparator.comparing(Apple::getWeight));
printApples();
}
@Test
public void sort5(){
inventory.sort(comparingInt(Apple::getWeight));
printApples();
}
@Test
public void sort6(){
inventory.sort(comparingInt(Apple::getWeight).reversed());
printApples();
}
/**
* 比较器链
*/
@Test
public void sort7(){
inventory.sort(comparing(Apple::getColor)
.reversed()
.thenComparingInt(Apple::getWeight));
}
private void printApples() {
inventory.forEach(System.out::println);
}
}